Images guide
JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use?
Compare four common image formats by compression, transparency, browser use, editing needs, and realistic file-size tradeoffs.
There is no universally best image format
Image format choice is a delivery decision. A photograph, a transparent logo, and a screenshot contain different kinds of visual information, so the same format will not encode all three equally well. The best choice is the one that preserves the features you need at a size and compatibility level your audience can use.
The formats at a glance
| Format | Typical compression | Transparency | Often suitable for | Main caution |
|---|---|---|---|---|
| JPG/JPEG | Lossy | No | Photographs and continuous tones | Artifacts accumulate when repeatedly re-encoded |
| PNG | Lossless | Yes, including partial alpha | Logos, diagrams, interface captures | Photographs can be much larger than JPG |
| WebP | Lossy or lossless | Yes | Web delivery needing flexible compression | Check the requirements of non-browser software |
| AVIF | Lossy or lossless-capable | Yes | Modern web delivery at efficient sizes | Encoding and application compatibility vary |
Lossy and lossless describe encoding, not overall quality
Lossy encoding discards information to reduce size. At a careful setting, discarded differences may be hard to notice; at an aggressive setting, edges can develop ringing, gradients can band, and blocks can become visible. JPEG is the familiar example. Lossless encoding reconstructs the encoded pixel values exactly when decoded. PNG uses lossless compression, but that does not mean a PNG created from a JPEG recovers the JPEG’s discarded information.
JPG: efficient for photographs
Photographs contain gradual changes, noise, and many colors. JPEG’s lossy model is designed for that material and is broadly supported by browsers, devices, office software, and publishing systems. It does not support transparency. It is a poor fit for tiny text, flat-color diagrams, and logos where compression halos around hard edges are conspicuous.
If a transparent PNG no longer needs transparency and contains photographic content, PNG to JPG can produce a more suitable delivery file. Inspect the background and fine edges because flattening transparency and applying lossy compression are meaningful changes.
PNG: exact pixels and useful transparency
PNG works well for interface screenshots, line art, icons, logos, and graphics with a limited palette or sharp boundaries. Its alpha channel can describe fully transparent and partially transparent pixels, making it useful for overlays. A PNG of a photograph may be far larger than a visually similar JPEG because lossless compression must retain every encoded pixel rather than approximate complex texture.
Why PNG sometimes becomes unexpectedly large
A 1600 × 900 photo contains 1.44 million pixels with irregular detail. JPEG can approximate that detail; PNG must represent it reversibly. Conversely, a 1600 × 900 diagram with a white background and a few flat colors contains repeated patterns that PNG can compress efficiently. Dimensions alone do not predict file size.
WebP: a flexible web-oriented option
WebP supports lossy and lossless modes, transparency, and animation. That makes it useful when a site wants one modern family for photos and transparent graphics. It is widely usable in current browsers, but a recipient’s desktop application, content-management system, or print workflow may impose narrower requirements. Format support is an end-to-end question, not only a browser question.
SimplifyConvert provides implemented routes for JPG to WebP, PNG to WebP, and WebP to JPG. Converting a transparent WebP to JPG requires flattening transparency because JPG cannot store it.
AVIF: efficient, modern, and worth compatibility checks
AVIF is based on AV1 image coding and can provide strong compression efficiency, including transparency and high-dynamic-range capabilities. It is useful for modern web image delivery when the publishing pipeline can encode it reliably and every important consumer can decode it. Encoding may take more work than older formats, and some editing, document, messaging, or legacy application workflows may still prefer JPG or PNG.
This guide explains AVIF’s established format behavior but does not direct readers to a SimplifyConvert AVIF converter: the relevant site routes were not reliable enough to describe as supported editorial recommendations in this phase.
Four practical choices
Product photograph
Start with JPG for broad delivery, or test lossy WebP/AVIF for a controlled web pipeline. Compare fine texture and gradients at the displayed size.
Transparent logo
Use PNG for predictable lossless edges and alpha, or lossless WebP where the full toolchain supports it. Do not use JPG if transparency must survive.
Interface screenshot
PNG often preserves small text and flat-color edges cleanly. A carefully tested lossless or high-quality WebP may reduce delivery size.
Office attachment
Choose the format the recipient’s software accepts. Compatibility can matter more than the smallest theoretical file.
Decision summary
Use JPG for broadly compatible photographs, PNG for sharp graphics and dependable transparency, WebP for flexible modern web delivery, and AVIF where compression efficiency justifies compatibility and encoding checks. Preserve an original master, export for the destination, and judge quality at the actual display size. If file size is the problem rather than format compatibility, the separate guide to image compression, dimensions, and quality explains which lever to change first.